unique steel bridge repair and strengthening: two case studies presentations... · 2016-11-07 ·...
TRANSCRIPT
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© 2014 HDR, all rights reserved.
Brandon Chavel, PhD, PEJacob Wroten, PE
Unique Steel Bridge Repair and Strengthening: Two Case Studies
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Lincoln Avenue Bridge
o Change in span lengths
o Strengthening
o Counterweights
o New pier
Hawthorn Parkway Bridge
o Beam crack
o Repair procedure
o Bridge raise
Presentation Outline
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Project Location
Cincinnati, Ohio
~3 miles North of Downtown CIN
Bridge spans over I-71
Lincoln Ave. Bridge
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Part of Design Build Project
I-71 and Martin Luther King Drive
Kokosing Construction Company
HDR Lead Designer
12 Bridges total
o 1 Existing RR Tunnel
o 2 Bridges Demolished
o 4 Major Rehabs
o 4 Minor Rehabs
o 1 Pedestrian Bridge
Lincoln Ave. Bridge
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Existing Structure
o 3-span Steel Girder Bridge => 59.0′ - 91.25′ - 88’.5′
o All supports skewed at 13.5°
o 7 girders at 9′-2″
o Non-composite superstructure
Lincoln Ave. Bridge
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Scope of Work
o Change span arrangement to 49.25′ – 101′ – 88.5′ (from 59.0′ - 91.25′ - 88’.5′)
o Relocate Pier 1 to accommodate traffic underneath Span 1
o Raise superstructure: 7.625″ at Forward Abutment
o Maintain traffic on bridge => Phased construction
Lincoln Ave. Bridge
New Pier 1 Raise 7.625″
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o Careful Consideration of
unloading and loading sequence
• Staged Construction Analysis
o Adjusting Spans resulted in:
• New Pier
» 4 column multi-column pier
» Spread footing on rock
» Conflict with existing
Lincoln Ave. Bridge
Existing
New Construction
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Strengthening center and end spans
Shift in bending moment diagram
Lincoln Ave. Bridge
Span 2 Repair
(all girders)
Span 1 Repair
(all girders)
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Strengthening center and end spans
• Partial Deck Removal and Replacement
Lincoln Ave. Bridge
C New Pier 1L C Existing Pier 1LSpan 2 Repair
(all girders)
Span 1 Repair
(all girders)
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Strengthening center span
• Partial Deck Removal & Replacement
Lincoln Ave. Bridge
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Strengthening center span
• Partial Deck Removal & Replacement
Lincoln Ave. Bridge
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Strengthening center span
• Partial Deck Removal & Replacement
Lincoln Ave. Bridge
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Strengthening end span
Lincoln Ave. Bridge
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Strengthening center and end
spans
o Allow flexibility
o Provide details around stiffeners
o Exact stiffener locations unknown
during design
o Field scan/survey used by detailer to
locate stiffeners
Lincoln Ave. Bridge
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o Bridge Raise
• Non uniform at each support
• 7.625” at Forward Abutment
• 0” at Rear Abutment
• Consideration of Skew and Deck
Profile
Lincoln Ave. Bridge
Rotate about
centerline of bearing
Raise at this end
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Counterweights in Span 1
Lincoln Ave. Bridge
Utility Duct
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Lincoln Avenue Bridge
o Change in span lengths
o Strengthening
o Counterweights
o New pier
Hawthorn Parkway Bridge
o Beam crack
o Repair procedure
o Bridge raise
Presentation Outline
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Solon, Ohio
Cuyahoga County
~20 miles Southeast of Downtown
Cleveland
Bridge spans over U.S. 422
Hawthorn Parkway Bridge
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Emergency repair due to beam hit
Full depth crack
Bridge was closed
ODOT temporarily plated over crack
Hawthorn Parkway Bridge
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Existing Layout
o 4-span Steel Beam Bridge
• 64.0′ - 91.0′ - 84.0′ - 59.0′
o All supports skewed 39°±
o Length of 304′±
o Horizontally curved alignment
Hawthorn Parkway BridgeTemporary Repair Plate
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Existing Superstructure
o 6 Rolled Beams (W36)
o Dog-legged framing plan
o 42′-10′′ out/out deck
o Two 14′ lanes and 8′ wide bridle
path
o Safety curbs, parapets, tubular
railing and fence
Hawthorn Parkway Bridge
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o Replacement options considered
• Fascia beam with shallower depth section
Partial length (Haunched beam section with unique splices)
Full length (Replace entire beam, crossframes and deck)
• Portion of fascia beam of the same depth
Additional field splice (reduce vertical clearance)
Existing field splice to existing field splice (selected option)
Hawthorn Parkway Bridge
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o Beam Hit Mitigation Improvements
• Raise Hawthorn Parkway
• Lower U.S. 422
Hawthorn Parkway Bridge
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o Selected Solution
• Replace beam field splice to field splice
• Partial deck removal
• Raise Hawthorn Parkway 4″ using steel shims
• U.S. 422 will be lowered with next major road construction project
o Additional Work
• Backwall and expansion joint modification
• Patch and seal concrete
• Salvage railing
• Replace fence
• Replace top 2.5″ of bridle path
• Approach slab and pavement
Hawthorn Parkway Bridge
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o Design and Analysis
• 3D Finite Element Modeling
• Construction sequencing
• Beam deflections, camber and
screed elevations
• Stress and code checks
Hawthorn Parkway Bridge
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o Accurately model construction
sequencing using 3D FEM
• Partial deck removal
• Partial beam removal
• Crossframe removal
• Temporary support location and
reactions
Hawthorn Parkway Bridge
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o Portion of fascia beam and crossframes removed
Hawthorn Parkway Bridge
Temporary Support Locations
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o New beam installed
Hawthorn Parkway Bridge
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o New crossframes installed
Hawthorn Parkway Bridge
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o Steel Details
• Replaced field splices
Field verify bolt hole locations
• Uses stiffener plates with slotted
holes to connect new crossframes
• 2″ steel shim plates under existing
bearings to raise superstructure
Hawthorn Parkway Bridge
Stiffener Pate with
Slotted Holes
Bearing Shim Plates
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o Screed Elevations
• Account for existing conditions
Profile and cross slope
• Contractor determined screed and
final deck elevations
• Provided screed points, blank
tables and sample calculations
• Ensure positive drainage
Hawthorn Parkway Bridge
Screed Lines
Sample Calculations and Table
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o Construction Photos
Hawthorn Parkway Bridge
Existing Cracked Beam
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o Construction Photos
Hawthorn Parkway Bridge
Crack and Repair Plate Temporary
Support
Deck Removal
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o Construction Photos
Hawthorn Parkway Bridge
New Beam
New Splice
Crossframe
Connection
Plates
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o Completed Project
Hawthorn Parkway Bridge
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o Completed Project
Hawthorn Parkway Bridge
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Lincoln Avenue Bridge
o Revised Span Arrangement
• Consider loading sequence
• New Pier
• Strengthening for moment shift
• Counterweights
Hawthorn Parkway Bridge
o Replaced Crack Beam
• Consider construction sequencing
• Temporary support reactions
• Maintain stability of beam during deck
placement
Flexibility of Steel Bridges
• Ability to change span arrangement
• Ability to replace a single field piece
Summary
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Lincoln Avenue Bridge
o Kokosing Construction Company
o ODOT District 8
Hawthorn Parkway Bridge
o Union Industrial Contractors
o ODOT District 12
Acknowledgements
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QUESTIONS……
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